Question 1025709
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Two containers of different capacities were used to fill a vat with 140 liters of liquid.  One container had a capacity of 1 liter and the other had a capacity of 4 liters.  Given that the contents of 50 containers were used to fill the vat, how many times was each container used?
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The guiding system of equations is 

x +  y =  50,   (1)
x + 4y = 140.   (2)

Use substitution or elimination method to get the solution

x = 20, y = 30,

where x = how many times 1-liter container was used, and y = that of 4-liter container.
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